Well, at least you're willing to admit that the level will go down. Of course, you seem to only be willing to attribute it to replacement of coal burning with natural gas burning, while completely ignoring the contribution of renewables. Let's be real here, however, and look at the last ten years. Currently, renewables are about 60% of the electricity mix of Germany, with nuclear negligible if any at all and fossil fuels very slightly below 40%. Over the last ten years, renewables have grown a little over 31% from their level ten years ago. In the meantime, fossil fuels have gone from over 50% to about 20%. While you are not incorrect that the fossil fuel mix is going to shift from being dominated by coal (currently lignite and hard coal are about 60% of fossil fuel use with lignite heavily dominating the coal mix now from 10 years ago when it was more of a 60/40 split for coal) to probably being dominated by natural gas, which will also reduce the CO2 per kWh, the actual proportion of fossil fuel usage in electricity generation is also on a downward trend. Even if the growth in renewables were only linear, they would still end up reaching 79% of generation.
So that would leave less than 20% of the pie (there's an "other category in the data I'm looking at that I assume is mostly trash burning) for fossil fuels and, as you pointed out, that percentage would also produce less CO2 (and other pollutants) proportionally as well from the shift to natural gas. So, even just with linear growth of renewables, the amount of fossil fuels used for electricity generation would be cut in half. Since natural gas simply produces less CO2 from burning, plus that the newer natural gas plants use more efficient combined cycle systems, the CO2 emitted by the natural gas portion would be about 50% of the coal portion. So, basically we take that 60/40 coal to natural gas split and say it becomes a 20/80 coal/natural gas split over ten years and the actual total between them is also cut in half by 50%. That would mean that the CO2 from fossil fuels would drop to about 38% of what it is now. There's that other category I mentioned earlier that is probably mostly trash burning, and that presumably produces CO2 at around the same level of coal. It is a fairly consistent 4%. Incidentally, that 4% seems like one of the reasons your numbers for France seem artificially low since France also burns garbage for power because it only makes sense to generate electricity from it if you are just going to burn it, and their proportion should not be significantly different from that in Gernany, but if it is, it should produce more CO2 than the numbers you keep using. Anyway, 38% of 60% is 22.8% and we'll tack on the estimated 6.7% from the other category for 29.5%. So, based on your numbers, that would bring the CO2 per kWh of electricity down to about 83.5 grams of CO2 per kWh in ten years.
Of course, all of that is based on the naive assumption that the growth in renewables is linear. All of the actual data shows it as closer to exponential or at least a j-shaped curve. That suggests that, in ten years, rather than simply increasing to around 79%, renewables would grow to something like 140% of power generation. That, of course is unlikely because 140% is clearly more power generation than needed. Not to mention that "other" category. For the time being, trash burning is not going away (it might be made carbon neutral through some form of carbon capture, which would require extra electricity beyond what it generates, of course). The point is though, that it is quite capable of displacing fossil fuel usage for electricity generation almost entirely. There are, of course, areas where it will not replace fossil fuels for electricity generation and that is for the off-grid and specialized areas that are covered in part by oil still being a tiny sliver of the fossil fuel electricity production. That mostly means generators. So either emergency generators or remote sites that use oil, natural gas, or maybe even coal for power. Of course, once again, those categories exist in France too, so I am wondering why those are not making it through to the CO2 per kWh numbers that you're using? There's also politics and business influence to consider. There are going to be generating facilities that are kept around to "save jobs", or because they are relatively new and therefore leaders will apply the sunk cost fallacy, or because it will be claimed that it will preserve tax revenue, or they might not even really bother with the excuses and everyone will know that it is because they are taking bribes, but nothing will be done about it, etc. Then there might be some semi-legitimate cases where there is an industrial process that uses fossil fuels and it co-generates electricity from waste heat. The point is that there is no good reason that Germany can not match France's CO2 per kWh for electricity generation or get close enough for all practical purposes.
Then we also have to consider that CO2 production per kWh of electricity generated is not really the only consideration. You can crow all you like about France's lower CO2 per kWh of electricity produced all you want, but the reality is that France only produces around 30% less CO2 than Germany per capita. The reason for this is that electricity generation is only a fraction of overall primary power usage. The solution for that is, of course, electrification. That mainly means transportation sector and replacing heat used in residential, commercial, and industrial settings where possible with heat pumps. Aside from that, a general efficiency push for wasteful processes in those sectors. This narrow focus only on electricity production is problematic since it distracts from the big picture. It has clearly distracted you, for example, if the CO2 per kWh in Germany didn't change at all, but the majority of cars and trucks in Germany became BEVs and the majority of fossil fuel burning heating systems were changed to heat pumps, Germany would end up producing less CO2 per capita than France, even with no change in the CO2 per kWh. Likely though, you would still be here spouting off about that rather than looking at the big picture.